问题 解答题
下面各题,怎样简便就怎样算.
7
8
-
1
6
+
5
6
2
3
×
1
4
+
2
3
×
1
2
2
5
+
3
10
)÷7×
5
8
7
9
÷
11
5
+
2
9
×
5
11
2
5
×75%+
3
4
×
3
5
25×
5
24
答案

(1)

7
8
-
1
6
+
5
6

=

7
8
+(
5
6
-
1
6
),

=

7
8
-
2
3

=

21
24
-
16
24

=

5
24

(2)

2
3
×
1
4
+
2
3
×
1
2

=(

1
4
+
1
2
)×
2
3

=

3
4
×
2
3

=

1
2

(3)(

2
5
+
3
10
)÷7×
5
8

=(

4
10
+
3
10
)×
1
7
×
5
8

=

7
10
×
1
7
×
5
8

=

1
16

(4)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=1×

5
11

=

5
11

(5)

2
5
×75%+
3
4
×
3
5

=

2
5
×
3
4
+
3
4
×
3
5

=(

2
5
+
3
5
)×
3
4

=1×

3
4

=

3
4

(6)25×

5
24

=(24+1)×

5
24

=24×

5
24
+
5
24

=5+

5
24

=5

5
24

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